I love finding out about insanely potent-yet-balanced cards like this. It's Radariah on crack for 1 purity. Let's see, he's got some level of synergy with Paladin (live through mass death forever!), any stat-boosting cards to help him kill stuff (Bromich, Daode, Martyr), and you could build a deck around him by going either 2x Verore + 1x Exiles (control focus, mass death synergy, just kill everything that gets in his way) with him as a commander +3x main (and since it's a control deck, Varyus would fit in naturally and helps you find more copies), and this guy could be your single win-condition, with some Martyr Golems to keep him alive, and being Verore you've got lots of kill spells to keep stuff out of his way. You could go also with any combination of either DoD, Verore or FD and buff his defense with Daodes while using Verore and/or FD to control the field and rely on a relatively small number of powerful threats (This guy, Paladin, Aerial Commando, and so forth) to out-tempo your opponent and you'd have the Rallying General to keep him alive. I love to see a card with 3+ abilities.